<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog"
            >添加分类</el-button
          >
        </el-col>
      </el-row>
      <!-- 表格区域 -->
      <!-- expand-type 控制展开符 -->
      <!-- selection-type 控制多选框 -->
      <!-- show-row-hover 控制鼠标移上去高亮 -->
      <tree-table
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border
        :show-row-hover="false"
      >
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            v-if="scope.row.cat_deleted === false"
            style="color:lightgreen"
          ></i>
          <i class="el-icon-error" v-else style="color:red"></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag
            size="mini"
            type="success"
            v-else-if="scope.row.cat_level === 1"
            >二级</el-tag
          >
          <el-tag size="mini" type="warning" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt">
          <el-button type="primary" icon="el-icon-edit" size="mini"
            >编辑</el-button
          >
          <el-button type="danger" icon="el-icon-delete" size="mini"
            >删除</el-button
          >
        </template>
      </tree-table>
      <!-- 分页区域 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>
    <!-- 分类的对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="30%"
      @close="addCateDialogClosed"
    >
      <!-- 添加分类的表单 -->
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
          <!-- options：用来指定数据源 -->
          <!-- props:用来指定配置对象 -->
          <el-cascader
            expand-trigger="hover"
            :options="parentCatelist"
            :props="cascaderProps"
            v-model="selectedKeys"
            @change="parentCateChanged"
            clearable
          >
          </el-cascader>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
/**
 * pagenum当前页码值【可选参数】如果不传递，则默认获取所有分类
 * pagesize每页显示多少条数据【可选参数】如果不传递，则默认获取所有分类
 */
export default {
  data() {
    return {
      catelist: [],
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      total: 0,
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          //表示当前列为模板列
          type: 'template',
          //表示当前列使用模板的名称
          template: 'isok'
        },
        {
          label: '排序',
          //表示当前列为模板列
          type: 'template',
          //表示当前列使用模板的名称
          template: 'order'
        },
        {
          label: '操作',
          //表示当前列为模板列
          type: 'template',
          //表示当前列使用模板的名称
          template: 'opt'
        }
      ],
      //控制分类的表单显示与隐藏
      addCateDialogVisible: false,
      //添加分类表单数据对象
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: ['blur','change'] }
        ]
      },
      //父级列表
      parentCatelist: [],
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectedKeys: []
    }
  },
  created() {
    this.getCateList()
  },

  methods: {
    //获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: this.queryInfo
      })

      if (res.meta.status != 200) {
        return this.$message.err('获取商品分类列表失败')
      }
      //把数据列表赋值给catelist
      this.catelist = res.data.result
      //获取数据总条数
      this.total = res.data.total
    },
    //监听pagesize改变
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    //监听pagenum改变
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    //显示分类对话框
    showAddCateDialog() {
      //获取父级分类列表
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    //选择项发生变化触发这个函数
    parentCateChanged() {
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[
          this.selectedKeys.length - 1
        ]
        this.addCateForm.cat_level = this.selectedKeys.length
        return
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    addCate() {
      console.log(this.addCateForm)
      //预校验
       this.$refs['addCateFormRef'].validate(async (valid) => {
          if (!valid) return
          const {data:res} = await this.$http.post('categories',this.addCateForm);
          if(res.meta.status!=201){
            return this.$message.error('添加分类失败')
          }
          this.$message.success('添加分类成功')
          this.getCateList()
          this.addCateDialogVisible=false
        });
    },

    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_pid = 0
      this.addCateForm.cat_level = 0
    },
    //获取父级分类列表
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 }
      })
      if (res.meta.status != 200) {
        return this.$message.err('请求分类列表数据失败')
      }
      this.parentCatelist = res.data
    }
  }
}
</script>

<style lang="less" scope>
.el-row .el-button {
  margin-bottom: 10px;
}
.el-cascader {
  width: 100%;
}
.el-scrollbar {
  height: 187px !important;
  padding: 10px 0px;
}
</style>
